linux-kernel - [PATCH 19/27] dm: dm.c: replace 'bio->bi_vcnt == 1' with !bio_multiple

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Date:	Tue,  5 Apr 2016 20:07:34 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org
Cc:	linux-block@...r.kernel.org, Christoph Hellwig <hch@...radead.org>,
	Boaz Harrosh <boaz@...xistor.com>,
	Ming Lei <tom.leiming@...il.com>,
	Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...hat.com>,
	dm-devel@...hat.com (maintainer:DEVICE-MAPPER (LVM)),
	Shaohua Li <shli@...nel.org>,
	linux-raid@...r.kernel.org (open list:SOFTWARE RAID (Multiple Disks)
	SUPPORT)
Subject: [PATCH 19/27] dm: dm.c: replace 'bio->bi_vcnt == 1' with !bio_multiple_segments

Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
 drivers/md/dm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index be49057..4c34f88 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2172,7 +2172,8 @@ static void dm_request_fn(struct request_queue *q)
 			pos = blk_rq_pos(rq);
 
 		if ((dm_request_peeked_before_merge_deadline(md) &&
-		     md_in_flight(md) && rq->bio && rq->bio->bi_vcnt == 1 &&
+		     md_in_flight(md) && rq->bio &&
+		     !bio_multiple_segments(rq->bio) &&
 		     md->last_rq_pos == pos && md->last_rq_rw == rq_data_dir(rq)) ||
 		    (ti->type->busy && ti->type->busy(ti))) {
 			blk_delay_queue(q, HZ / 100);
-- 
1.9.1